The Preparation And Physicochemical Proerties Of Mesoporous Nickel Oxides

High specific surface area mesoporous nickel oxide catalysts were fabricated in citric acid assisted by directly thermal decomposition approach with nickel nitrate as the metal source. The physicochemical properties of as-prepared catalysts were characterized by XRD, TEM, SEM, TPR and N2 adsorption desorption measurement, and the catalytic performance was evaluated for the complete oxidation of toluene. It was found that the mesoporous NiO catalysts were spherical particles with worm-like mesoporous structure. The meso-Ni-1-400 catalyst of raw material equimolar ratio via 400 ℃ calcinations process exhibits the highest specific area of 225 m2·g-1, the average pore size of 5.9 nm and pore volume of 0.36 cm3·g-1. The good catalytic oxidation activity of the as-prepared catalysts was related to its large surface area, good low-temperature reducibility and multiple oxidation state nickel species coexistence.At the same time, mesoporous nickel oxide (NiO) nanoparticles were synthesized by the thermal decomposition strategy of Ni(NO3)2·9H2O using oxalic acid dihydrate as the mesoporous template agent. The pore structure of nanocrystals could be controlled by the precursor to oxalic acid ratio, thermal decomposition temperature and thremal decomposition time. The texture and chemistry of nickel oxide nanocrytals were characterized by varieties of analytical techniques. The results showed that the most excellently mesoporous nickel oxide particles (m-Ni-1-4) with developed wormlike pores were prepared under the conditions of the mulled equimolar precursor and oxalic acid, calcined 4 h at 400 ℃. The specific surface area and pore volume of m-Ni-1-4 are 236 m2·g-1and 0.42 cm3·g-1, respectively. In mild reaction conditions (low temperature and atmospheric pressure), with benzene as raw materials, hydrogen peroxide as oxidant, ammonia as amination agent, the ammoniate benzene to aniline was studied. We discussed the influence of aniline production on the dosage of the ammonia, hydrogen peroxide and ammonia water, reaction temperature. In the conditions of catalyst 0.4 g, reaction temperature of 60℃,30 mL ammonia,15 mL hydrogen peroxide and reaction time 1 h,5 mL of benzene to aniline was 4.6 mg.